What was Maggie Simpson's first canonical word, not including the Tracey Ullman shorts?

Maggie Simpson's first canonical word, excluding her appearances in the Tracey Ullman shorts, was "Daddy." This is because in the episode "Lisa's First Word" from season 4 of The Simpsons, Maggie utters the word "Daddy" as her first coherent sentence. This moment is significant because it reveals Maggie's ability to communicate verbally and creates a heartwarming and memorable scene within the Simpson family dynamic.